Structure and magnetic properties of iron-composed nanowires, obtained in the pores of track membranes

The ensembles of Fe-Co and Fe-Ni nanowires were obtained. Microscopy investigations demonstrated non-homogeneous distribution of elements (in microscale). It was shown that elemental composition changed along the nanowire length. The features of electrodeposition were investigated and "anomalous co-deposition" was demonstrated. Crystal fine fields were estimated by Moessbauer spectroscopy, and dependence of spectra parameters on pores diameters were found. It was concluded that Fe-Ni wires consists of two phases. Fe-Co wires were found to be hard-magnetic, while Fe-Ni are soft-magnetic. At the same time Fe-Ni wires with rather low diameters could demonstrate hard magnetic properties too. All samples demonstrated high magnetic anisotropy. (authors)